What are the advantages of having 2 servos control the same pitch joint as apposed to just 1. There must be a power distribution between the two, so would this allow for greater speed or increased torque?
If there is any confusion, both servo shafts would be moving the same joint at the same time.
Let me know if I can clear anything up.
You can bump this to servos if this is not the correct location for this topics.
2X torque!
But they must be same type/rev sersvo, sent the same signal (Y splitter), and adjusted not to fight each other!
Alan KM6VV
Yep, connecting two servos to the same joint results in more torque. The speed remains about the same.
This is good news,
thanks for the responses!
In lieu of the y-splitter…
Assuming the PWM requirement to move a single servo on a pitch joint is… X
Then will the PWM signal be the same (X) for this Y splitter?
In other words, can I set the PWM up for one servo and then hook the other one up with a Y splitter and assume the PWM is okay?
I am asking instead of testing because I have no parts and everything is theoretical at this point.
Thanks.
The simple wire ‘Y’ splitter will send identical signals to both servos. To use this, you will have to orientate both servos the same, i.e., both shafts point “left” (not on opposite sides of the object being rotated, which would be 180 degrees)
Otherwise, you can send one servo X, and the other servo (3000 - X). The limitation here is that not all servos are linear, so they may not match up. Same goes for “electronic” Y cables, they will have the same (possibly more) of a problem.
Another option is to re-wire one servo such that it turns the opposite direction. Usually reversing the pot outside wires (ends) and also the motor wires (as I recall) will do it. In this case, the pots need to be good and linear.
Alan KM6VV
i did something similar in 2009:
http://i531.photobucket.com/albums/dd355/innerbreed/100_0639.jpg
http://i531.photobucket.com/albums/dd355/innerbreed/100_0637.jpg
So, in the case of innerbreed’s picture:
The servo’s are operating in opposite directions. You must have used two outputs from a controller? A ‘Y’ splitter would not have worked in this case, unless you rewired the servo as KM6VV mentioned in his post. In order to reverse the wires on the motor and pot, you must ensure that the pot is linear, and this can be found in the data sheets?
Thanks for all the help,
All servo pots are linear taper.
You haven’t said what application the servos are to be used in, so some answers will be “it depends”. You could add a second servo in parallel fairly easily for some applications. In the below servo arm at the bottom servo, a second servo could be added fairy easily in parallel to the existing one by adding it in place of the bearing side of the bracket of the existing servo.
Yes, the resistance function of the pots is a linear one. However, they must actually BE linear (think accuracy), and have the same center point relative to the mechanicals of the servo as well. No offsets either! Not as easy.
Alan KM6VV
There is enough flex in a dual servo bracket hardware setup that the servo pots will not need to be identical. You can go to extremes with the discussion, but in reality it just works.
That’s the picture I was looking for.
Good picture!
Good to know!
You’ll notice that the two servos are connected in tandem, both orientated the same way. Using the same servo brand and model, you should have minimal problems (get them in the right spline, 'tho ;>)
Alan KM6VV
Perfect, that’s the setup that I need.
Thanks for all the help.
